Comparison Mercedes-Benz R-class (W251) Long R 500 V8 (306 Hp) 4MATIC G-TRONIC & Audi A4 Avant (B9 8W, facelift 2020) 40 TDI (204 Hp) quattro ultra MHEV S tronic
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| Brand: | Mercedes-Benz | Audi |
| Model: | R-class | A4 |
| Generation: | R-class (W251) Long | A4 Avant (B9 8W, facelift 2020) |
| Engine / modification: | R 500 V8 (306 Hp) 4MATIC G-TRONIC | 40 TDI (204 Hp) quattro ultra MHEV S tronic |
| Production start: | 2006 year | 2020 year |
| Production end: | 2008 year | |
| Coupe type: | Combi | |
| Num. of Doors: | 5 | 5 |
| Num. of seats: | 5 | 5 |
| Fuel consumption / economy - combined: | 13.3 l/100 km | |
| Fuel Type: | Petrol (Gasoline) | Diesel |
| Drag coefficient: | 0.27 | |
| Fuel tank volume: | 80 l | 58 l |
| Combined fuel consumption (WLTP): | 5.2-6.0 l/100 km | |
| Emission standard: | EURO V | Euro 6d-ISC-FCM |
| CO2 emissions: | 317 g/km | |
| Power: | 306 hp | 204 hp |
| Max power in: | 5600 rpm. | 3800-4200 rpm. |
| Maximum speed: | 245 km/h | 210 km/h |
| Acceleration from 0 to 100 km/h: | 7 sec | 7.1 sec |
| CO2 emissions (WLTP): | 137-157 g/km | |
| Torque: | 460 Nm @ 2700-4750 rpm. | 400 Nm @ 1750-3250 rpm. |
| Engine position: | Front, longitudinal | Front, longitudinal |
| Engine displacement: | 4966 cm3 | 1968 cm3 |
| Engine oil capacity: | 5.5 l | |
| Coolant: | 11.9 l | |
| Fuel System: | Multi-point injection | Diesel Commonrail |
| Position of cylinders: | V engine | Inline |
| Number of cylinders: | 8 | 4 |
| Number of valves per cylinder: | 4 | 4 |
| Compression ratio: | 10 | 15.5 |
| Piston Stroke: | 84 mm | 95.5 mm |
| Cylinder Bore: | 97 mm | 81 mm |
| Wheel Drive: | All wheel drive (4x4) | All wheel drive (4x4) |
| Number of Gears (automatic transmission): | 7G-TRONIC | 7 S tronic |
| Length: | 5157 mm | 4762 mm |
| Width: | 1922 mm | 1847 mm |
| Width including mirrors: | 2022 mm | |
| Height: | 1674 mm | 1460 mm |
| Wheelbase: | 3215 mm | 2820 mm |
| Front track: | 1661 mm | 1572 mm |
| Rear (Back) track: | 1651 mm | 1555 mm |
| Front overhang: | 899 mm | |
| Rear overhang: | 1043 mm | |
| Minimum volume of Luggage (trunk): | 495 l | |
| Maximum amount of Luggage (trunk): | 2385 l | |
| Front suspension: | Double wishbone | Multi-link suspension |
| Rear suspension: | Independent, spring multi-link with stabilizer | Multi-link independent |
| Max weight: | 2895 kg | 2230 kg |
| Front brakes: | Ventilated discs | Ventilated discs |
| Rear brakes: | Ventilated discs | Disc |
| Kerb Weight: | 2240 kg | 1625 kg |
| ABS: | yes | |
| Steering type: | Steering rack and pinion | |
| Power steering: | Hydraulic Steering | Electric Steering |
| Max. roof load: | 100 kg | 90 kg |
| Permitted trailer load with brakes (8%): | 2000 kg | |
| Minimum turning circle (turning diameter): | 12.4 m | 11.6 m |
| Permitted trailer load with brakes (12%): | 2100 kg | 1800 kg |
| Permitted trailer load without brakes: | 750 kg | 750 kg |
| Permitted towbar download: | 80 kg | |
| Tire size: | 255/55 R19 W | 225/50 R17 |
| Wheel rims size: | R19 | 7.5 J x 17 |